質問編集履歴
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ソースコード貼りました。
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イベントハンドラの記述の仕方で挙動が異なるのはどういうことなのでしょうか?
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よろしくお願いいたします。
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```HTMLソースコード
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title>JS勉強</title>
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<link rel="stylesheet" type="text/css" href="../css/stylesheet.css">
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<link rel="stylesheet" type="text/css" href="./bootstrap/bootstrap-4.3.1-dist/css/bootstrap.min.css">
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<script src="../js-jq/jquery-3.4.1.min.js"></script>
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<script src="../js-jq/myjs.js"></script>
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</head>
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<body>
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<header>
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<h1>JavaScript</h1>
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</header>
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<div id="main" class="container">
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<div id="area51">
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<div id="changeable-area">
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<div id="text-area">
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<span>something</span>
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</div>
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</div>
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</div>
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<div id="button-wrapper"><button id="trigger-button">TRIGGER</button></div>
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<div id="message-area">
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<span>some messages are written in this area.</span>
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</div>
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<p class="button-area"><button id="pic-button">PIC</button></p>
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<div class="pictures">
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<img src="../images/test1.jpg">
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</div>
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</div>
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</body>
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<footer>I'm learning JavaScript.</footer>
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</html>
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```
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```CSS
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*{
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margin:0; padding:0;
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}
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#pics img{
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width: 300px;
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}
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body{
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text-align: center;
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}
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footer{
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text-align: center;
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height: 50px;
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line-height: 50px;
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color: whitesmoke;
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background-color: cornflowerblue;
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font-weight: bold;
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margin-top: 15px;
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}
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header{
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height: 60px;
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color: whitesmoke;
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background-color: #333333;
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line-height: 60px;
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margin-bottom: 15px;
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}
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header h1{
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margin-left: 10px;
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}
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#trigger-button{
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border-radius: 3px;
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}
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#area51{}
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#changeable-area{
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width: 100%;
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height: 250px;
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border: solid 1px #333333;
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margin: 0 auto;
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font-size: 20px;
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font-weight: bold;
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border-radius: 4px;
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text-align: center;
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}
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#text-area{
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padding: 5px 15px 30px 15px;
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}
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#message-area{
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height: 50px;
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border: solid 1px #333333;
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border-radius: 4px;
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text-align: center;
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width: 60%;
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margin: 0 auto;
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overflow: auto;
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}
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#message-area span{
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font-weight: bold;
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font-size: 13px;
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}
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#text-area{
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height: 250px;
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word-break: break-all;
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margin: 0 auto;
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overflow: auto;
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}
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#trigger-button{
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margin: 0 10px;
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width: 80px;
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line-height: 25px;
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border-radius: 3px;
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}
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#button-wrapper{
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text-align: center;
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margin: 10px 0;
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}
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.pictures{
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margin: 0 auto;
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width: 640px;
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}
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#pic-button{
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width: 50px;
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border-radius: 4px;
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}
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.button-area{
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text-align: center;
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margin-top: 10px;
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}
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```
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```JavaScript
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$(document).ready(function(){
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function pic_status(){
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var ma = $("#message-area:first").find("span");
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if (pic_style === "none"){
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ma.text("the pic is hidden");
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}else{
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ma.text("the pic is shown");
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}
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}
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window.onload = pic_status();
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$("#trigger-button").click(function(){
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$("#text-area").prepend("<span>a text was created. </span>");
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})
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var pics = $(".pictures");
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var pb = $("#pic-button");
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var pic_style;
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pb.click(function(){
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pics.toggle();
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pic_style = pics.css("display");
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pic_status();
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})
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})
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```
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